sanspie
ef59ae297f
Theme tokens for every editor color with a literal check, System/Dark/Light preference that follows the OS, light goldens, Scene View overlays that keep viewport colors.
24 lines
602 B
Go
24 lines
602 B
Go
package theme
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import "aego/core/mathx"
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// Over is c drawn with its alpha over the opaque bg.
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func Over(c, bg mathx.Color) mathx.Color {
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a := c.A
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return mathx.Color{R: c.R*a + bg.R*(1-a), G: c.G*a + bg.G*(1-a), B: c.B*a + bg.B*(1-a), A: 1}
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}
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// Luminance is the relative luminance of a linear colour.
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func Luminance(c mathx.Color) float32 {
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return 0.2126*c.R + 0.7152*c.G + 0.0722*c.B
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}
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// Contrast is the WCAG contrast ratio of fg over bg.
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func Contrast(fg, bg mathx.Color) float32 {
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a, b := Luminance(Over(fg, bg)), Luminance(bg)
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if a < b {
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a, b = b, a
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}
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return (a + 0.05) / (b + 0.05)
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}
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